Fire Safe - Secondary metal-to-metal seal ACTS as backup if primary seal is destroyed by fire.

防火安全-如果第一个密封被火烧坏，则第二个金属对金属密封作为后备密封发挥作用。

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However, fire officers have said a complete inventory of the damage will not be possible until the cathedral structure has been deemed safe.

然而，消防官员表示，在大教堂结构被认定为安全之前，不可能对其损坏情况进行全面清点。

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Treasurys are the only sure-fire safe asset around, even though real yields on shorter-dated U.S. debt are negative.

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But after shopping the footage to other filmmakers and finding no interest, he locked it in a fire safe, where it stayed for three years.

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But if it is down to Corgi engineers to check your fire or boiler is safe can you really be sure that they do any better?

BBC: Frontline Scotland graphic